地理学报 ›› 1994, Vol. 61 ›› Issue (1): 46-54.doi: 10.11821/xb199401006

• 论文 • 上一篇    下一篇

青藏高原西北部17000年以来的介形类及环境演变

李元芳, 张青松, 李炳元   

  1. 中国科学院国家计划委员会地理研究所
  • 收稿日期:1992-09-01 修回日期:1993-02-01 出版日期:1994-01-15 发布日期:1994-01-15
  • 基金资助:
    国家自然科学基金

OSTRACOD FAUNA AND ENVIRONMENTAL CHANGES DURING THE PAST 17 000 YEARS IN THE WESTERN TIBET

Li Yuanfang, Zhang Qingsong, Li Bingyuan   

  1. Institute of Geography,Chinese Academy of Sciences and the State Planning Commission of the People’s Republic of China, Beijing 100101) Gasse F. (Universite de Paris-Sud, F-91405 Orsay cedex, France
  • Received:1992-09-01 Revised:1993-02-01 Online:1994-01-15 Published:1994-01-15

摘要: 通过班公错和松西错两钻孔以及红山湖地层剖面的介形类分析,讨论了昆仑山、喀喇昆仑山地区晚更新世晚期以来的主要气候事件和环境变迁。

关键词: 青藏高原, 介形类, 末次冰期, 冰后期, 环境演变

Abstract: Two cores of samples from Bangong Co and Sumxi Co and lacustrine sedimentary samples from one exposure near the Hongshan lake were collected. In order to obtain information about the environmental changes in the West Kunlun and Karakorum Mountains region since the late Pleistocene. detail analyses of ostracods have been carried out. On the basis of the distribution of ostracod fossils and their palaeoecological characters.it can be considered that a cold climate occurred beween 17 000 and 12 000 a BP, especially in the period 17 000-15 000 aBP. The runoff into the lake might slightly increase which infers a little warm up after 15 000 aBP. Assemblage character of ostracods and sedimentary features shows that the lakes in this area were slightly extended during the time of 12 500-12 000 aBP. No ostracod has been found in the strata in 11 500-10 000 aBP. This may correspond to the cooling event of Younger Dryas. When the Younger Dryas ended. the temperature rose rapidly, fine hydrological conditions for the development of ostracods appeared during the period about 10 000 aBP and 7 500-6 000 aBP which coincided with the rise of lake level and a warm-humid climate. Clinatic deterioration occurred since 6 000-5 500 aBP The water in the Bangong Co became slightly saline after 5 500 aBP. 

Key words: Qinghai-Xizang Plateau, Ostracod Fauna, Last Glaciation, Post Glaciation, environmental variation